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13.4 UTRAN AIR INTERFACE 43713.4.1 OverviewUTRAN Terminology. The UTRAN standards use slightly different terminologyfrom what is commonly used in CDMA literature:UTRANUplinkDownlinkUser equipment (UE)Radio network subsystem (RNS)Node BRadio network controller (RNC)ScramblingControl planeUser planeHandoverRadio frameUSIMCDMA LiteratureReverseForwardMobile station (MS)Base station (BS)Base transceiver station (BTS)Base station controller (BSC)Spreading (when bit rate is unchanged)Signaling message flowUser-data message flowHandoffFrameUIMThe following sections use the common CDMA terminology whenever doing sofacilitates understanding.UMTS Network Model. The UMTS network is divided into two parts(Fig. 13.4-1) [31,32]:1. Radio access network (RAN)2. Core network (CN)The radio access network includes satellite links but this chapter describes only theterrestrial portion of UTRAN. UTRAN covers the portion of the cellular networkfrom the mobile station (UE) to the base station controller (RNC). The referencepoint between the UE and the base station (RNS) is called Uu, and the onebetween the base transceiver station (Node B) and RNC is called Iub.Figure 13.4-1. UMTS network and interfaces.

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